nv50: support the InstanceID system value

src/gallium/drivers/nv50/nv50_program.c

@@ -328,10 +328,15 @@ prog_decl(struct nv50_translation_info *ti,
       }
       break;
    case TGSI_FILE_SYSTEM_VALUE:
+      /* For VP/GP inputs, they are put in s[] after the last normal input.
+       * Let sysval_map reflect the order of the sysvals in s[] and fixup later.
+       */
       switch (decl->Semantic.Name) {
       case TGSI_SEMANTIC_FACE:
          break;
       case TGSI_SEMANTIC_INSTANCEID:
+         ti->p->vp.attrs[2] |= NV50_3D_VP_GP_BUILTIN_ATTR_EN_INSTANCE_ID;
+         ti->sysval_map[first] = 2;
          break;
       case TGSI_SEMANTIC_PRIMID:
          break;
@@ -392,6 +397,18 @@ nv50_vertprog_prepare(struct nv50_translation_info *ti)
       }
    }
 
+   for (i = 0; i < TGSI_SEMANTIC_COUNT; ++i) {
+      switch (ti->sysval_map[i]) {
+      case 2:
+         if (!(ti->p->vp.attrs[2] & NV50_3D_VP_GP_BUILTIN_ATTR_EN_VERTEX_ID))
+            ti->sysval_map[i] = 1;
+         ti->sysval_map[i] = (ti->sysval_map[i] - 1) + num_inputs;
+         break;
+      default:
+         break;
+      }
+   }
+
    if (p->vp.psiz < 0x40)
       p->vp.psiz = p->out[p->vp.psiz].hw;
 

src/gallium/drivers/nv50/nv50_program.h

@@ -111,6 +111,7 @@ struct nv50_translation_info {
    ubyte output_file;
    ubyte input_map[PIPE_MAX_SHADER_INPUTS][4];
    ubyte output_map[PIPE_MAX_SHADER_OUTPUTS][4];
+   ubyte sysval_map[TGSI_SEMANTIC_COUNT];
    ubyte interp_mode[PIPE_MAX_SHADER_INPUTS];
    int input_access[PIPE_MAX_SHADER_INPUTS][4];
    int output_access[PIPE_MAX_SHADER_OUTPUTS][4];

src/gallium/drivers/nv50/nv50_tgsi_to_nc.c

@@ -1159,6 +1159,13 @@ emit_fetch(struct bld_context *bld, const struct tgsi_full_instruction *insn,
    case TGSI_FILE_PREDICATE:
       res = bld_fetch_global(bld, &bld->pvs[idx][swz]);
       break;
+   case TGSI_FILE_SYSTEM_VALUE:
+      res = new_value(bld->pc, bld->ti->input_file, NV_TYPE_U32);
+      res->reg.id = bld->ti->sysval_map[idx];
+      res = bld_insn_1(bld, NV_OP_LDA, res);
+      res = bld_insn_1(bld, NV_OP_CVT, res);
+      res->reg.type = NV_TYPE_F32;
+      break;
    default:
       NOUVEAU_ERR("illegal/unhandled src reg file: %d\n", src->Register.File);
       abort();